We discussed how to diagram and evaluate the relationship between 2 sets of data, represented by unconnected points on a graph. An unlabeled graph of 2 events is drawn on the board showing a bunch of scattered points to represent the accumulated data. The best fit line is drawn and explained that it does not connect all the dots but lies so that the distribution of the data dots is equal below and above the line. The slope of the line either indicates a positive or negative correlation. A second, labeled graph, is sketched showing the years of car ownership of a $15,000 Dollar car and the % of decrease in the valuation. A best fit line is drawn on an 8 year term of ownership used for the time of sale. The % is located and then the dollar amount for sale is determined by the percentage of the original cost.